Combined gas and oil burner



Dec. 1933- N. HUBBARD El AL 1,938,335

COMBINED GAS AND OIL BURNER Filed Oct. 20, 1927 5 Sheets-Sheet l Dec. 5,1933. N, HUBBARD -1- AL 1,938,335

COMBINED GAS AND OIL BURNER Filed Oct. 20, 1927 5 Sheets-Sheet 2 Fig; Z

2 jwgfi/ INVENTORS hmu J JMATTORNEYS 5, 1933. N. HUBBARD ET AL COMBINEDGAS AND OIL BURNER Filed Oct. 20, 1927 5 Sheets-Sheet 3 INVENTOR5 DEC.5, 1933. N HUBBARD r AL 1,938,335

COMBINED GAS AND OIL BURNER I )nmJW INVENTORS" J BY x b I ATTORNEYS Dec.5, 1933. HUBBARD r AL 1,938,335

COMBINED GAS AND OIL BURNER Filed 001;. 20, 1927 5 Sheets-Sheet 5 Fig; 7

M Y W )1 JM INVENTORS ATTORNEY5 @atented @ee. 5, 1933 masses coivmrnsnGAS Ann on. BURNER Norman Hubbard, Elizabeth, N. 3., and Matthias S.Gerend, San Francisco, Calif., assignors to The Babcock & WilcoxCompany, Bayonne,

N. 1., a cerporation of New Jersey Application @ctober 2t),

13 (Claims.

This invention relates to a fuel burner by means of which either gas oroil or both may be burned, and will be understood from the descriptionin connection with the accompanying drawings in which Fig. 1 is a frontelevation partly broken away; Fig. 2 is a longitudinal section throughthe device; Fig. 3 is a section along the line 33 of Fig. 4; Fig. 4 is afront view of one of the details; Fig. 5 is a longitudinal section on anenlarged scale showing another detail; Fig. 6 is an end view of Fig. 5;Fig. 7 is a section similar to Fig. 2 showing some of the parts indiiferent positions, and Fig. 8 is a side elevation of an oil burnerelement.

In the drawings reference character 10 (Fig. 2) indicates the boilerfront that is lined on the furnace side with tile or brick 11. A metalcone l2 fits into an opening 13 in the boiler front, and may be providedwith radially extending plates 2@ or guide vanes 14 that are inclined atan angle to the axis of the cone. A lip or bead 15 is pro- Vided on theoutside of the cone 12 at its inner end and bricks 15 that may beradially mounted on the cone are provided with notches or slots to fitover the lip 15 to keep the same in place. The lip or bead 15 isprovided with a slot 15' or interrupted portion for a short distancecircumferentially at its upper side so that the brick or tile 15 can beinstalled even with the circumferential row of tile 11 in place, bybringing the brick or tile 16 to a position opposite the notch 15' andslipping them into place in a direction perpendicular to the boilerfront 10, the tile 16 being moved in a circular path around the lip 15until a ring is completed. The reverse operation is performed to removethe tile 16.

A cylindrically shaped air chamber, here shown as an air register 17 isslidable into position along guide rails 18 in front of the cone 12. Theguide rails 18 are attached to the boiler front 10. A cover plate 20,circular in shape, is provided at the outer end of the register 17 andcarries on the front face thereof a shield 21 spaced a short distancefrom the cover plate. The cover plate is attached to the flange or rim23 of the register 1'7 by means of bolts 22. A ring 25 having a toothedsegment 26 is revolubly mounted on the annular flange 27 -0f the coverplate 20. A pinion 28 on a shaft extending between the plate 20 andshield 21, meshes with the toothed segment 26 and ,is providedwith ahandle 29 by which the pinion may be revolved. The inner edge of thering 25 (Fig. 1) is provided at intervals with slots 30 into which theinturned ends of pivoted rods or arms 31 extend. These piv- 1927'.Serial No. 227,4492

oted arms 31 carry slightly curved air doors 32 which, when turned totheir outermost positions, constitute part of the cylindrical surface ofthe air register 17. By revolving the pinion 28, the ring 25 is turned,thus swinging the arms 31 and moving the doors 32 to differentpositions, thus adjusting the sizes of the air openings through theregister. A ring 25' may be attached to the plate 20 and spacedtherefrom to protect the air door mechanism somewhat from the heat ofthe furnace. The side wall 33 of the air box that communicates with theregister 17 is provided with a circular opening 34 that is large enoughto permit passage therethrough of the cone 12 and register 17, but issmaller than the cover plate 20. When this cover plate 20 is broughtinto contact with the wall 33 of the air box, the flange of the cone 12is pressed against the boiler front 10 with the air register 17 in placebetween the cone 12 and cover 20. The cover 20 may be clamped to thewall 33 to form an air-tight joint by means of the bolts 35 and nuts 36.The ends of the guide rails are provided with flanges that are attachedto the side wall 33 and the boiler front 10.

A circular cover 38 is revolubly mounted at the.

center of the cover plate 20 and is provided with a flange 39 that fitsagainst the annular flange 27 on the plate 20, these flanges. being soshaped as to provide a conical seat. Radially positioned dogs '40 (Figs.3 and 4) are provided at opposite edges of the cover 38. The inner endsof the dogs are attached to the cover by means of. the holts 41 and theouter ends extend slightly beyond the edge of the cover. Handles 42areattached to the flange of the cover and the reduced ends 43' thereofextend through the cover and are threaded to extend into correspondingthreaded holes in the dogs 40. Notches 45 are provided along the insideedges of the opening 44 that is surrounded by the flange 27 of the coverplate 20. These notches 45 are of sufficient depth to permit the passagetherethrough of the extending ends of the dogs 40. After the dogs 40pass through the notches 45, the cover 38 can be turned slightly to lockthe same in place. Stops 46 are provided on the backside of the plate 20to limit the circumferential movements of the dogs 40. The cover 38carries a central hub or bearing 47 and a peep hole 48 is provided forthe cover.

A tube 50 (Figs. 2, 5 and 7) extends through and fits closely within thehub 47 and is long enough to extend into the cone 12 when the parts arein place. The ends of the tube 50 are threaded as shown at 51 and 52. Atube 53 sufficiently smaller than the tube to leave an annular spacebetween the tubes when they are concentrically mounted, is provided witha threaded end 54. A hollow member is provided with threaded holes onopposite sides, into .which holes the threaded ends of the tubes 50 and53, respectively, are screwed. The hollow member 55 is also provided onits lower side with a screw threaded opening 56 into which a pipe 57 isscrewed. The pipe 57 is provided with a three-way valve 58 so thatcommunication from this pipe can be established either with the gas pipe59 or an air pipe 59'.

A gas burner 60 (Figs. 2 and 5) is screwed upon the threaded end 52 ofthe pipe 50. The side of the gas burner 60 opposite the screw threadedportion fits tightly around the end of the tube 53 that projects beyondthe threaded end of the tube 50. The annular rim of the burner 60 isprovided with a plurality of holes 61 or an annular slot at an angle ofapproximately 60 to the axis of the tube 50.

' An oil burner tube 62 (Figs. 7 and 8) extends through the tube 53.This oil burner tube is of the well known type that is provided with aspray at the inner end. When the tube 62 is in'place, it may be heldsecurely by means of the yoke 63 that is pivoted at 64 and has atightening bolt 65 that contacts with an extension on the tube 62, asmost clearly indicated in Fig. 71

An air deflector 68 that is somewhat conical.

in shape and is provided with struck in plates 69 to give a swirlingmotion to the air that passes therethrough, is slidably mounted by meansof the sleeve 70 upon the tube 50. A handle '71 that may be pivoted at72 extends from the sleeve 70 through a hole 73 in the cover 38.

The operation is as follows: The air doors 32 of the air register 17 areadjusted to the desired positions by means of the pinion 28 to give theproper amount of opening for the entrance of air from the air box. Theair entering through the register 1'7 then passes through the cone 12and is given a whirling motion by the deflecting plates 14. When gasalone is to be burned, the three-way valve 58 is turned to opencommunication with the gas supply pipe 59, whereupon the gas passesthrough the pipe 57 into the hellow member 55 from which it passesthrough the annular space between the tubes 50 and 53, thence ovt,. ofthe holes 61 of the gas burner 60, where 'it i commingled with theentering air, passing through the cone 12. When oil is to be burned, itis admitted through the oil burner 62 and is sprayed into the air thatpasses into the furnace through the cone 12. When oil is being burned,the three-way valve 58 may be turned to admit air through the pipe 59,which passes through the annular space between the tubes 50 and 53, thusaiding in keeping the oil burner cool. However, gas instead of air maybe admitted through this inlet space from the gas pipe 59 while oil ispassing through the oil tube 62, thus enabling a mixture of gas and oilto be burned. Also when the fuel is changed from gas to oil, or viceversa, the/ignition of the new fuel can be effected from the fuel thatis about to be shut off. When gas alone is being burned, the

can be removed by loosening the nuts 19 without disturbing the boilerfront 10 or the wall 33 of the air box, and can be replaced by slidingthe same along the guide rails 18 and tightening the nuts.

The tubes 50 and 53 through which the fuel is introduced, can be quicklyremoved and replaced by turning the cover 38 a short distancecircumferentially to permit the projecting ends of the dogs 40 to passthrough the notches 45. The brick 16 can be installed or replacedwithout entering the furnace after the cover 38 and the parts carriedthereby are removed.

The invention is suitable not only for burning gas and oil or a mixtureof the two but also for burning other liquid or gaseous fuels orpowdered coal or other solid fuels that are suspended in a gas.

We claim:

1. In a fuel burner, tubes for oil and gas one of which is within theother, a hollow member to the opposite sides of. which said tubes areconnected at one end, an air register through which said tubes extend,means for regulating the amount of air entering said register, saidmeans comprising pivoted doors and a revoluble ring for operating saiddoors, and a plate for supporting said tubes, said register beingconnected to said plate.

2. In a fuel burner, an air register, means for retaining said airregister in proximity to an opening in a furnace wall, and means forprojecting different fuels through said opening, said first named ineanscomprising guide rails that extend outwardly from said furnace wall.

3. In combination, a furnace wall having an opening therethrough, a fuelburner having an air register larger in diameter than said opening, anair box with an opening for said register to pass through, a' cover forsaid opening, fuel feeding means supported by said cover, and meansmounted on said cover for regulating said air register.

4. In combination, a furnace wall having an opening therethrough, a fuelburner having an air register larger in diameter than said opening, anair box with an opening for said register to pass through, a cover forsaid opening, fuel feeding means supported by said cover, and an airdeflector mounted on said fuel feeding means.

5. In combination, a furnace wall having an opening therethrough, a fuelburner having an air register larger in diameter than said opening, anair box with an opening for said register to pass through, a cover forsaid opening, and fuel 130 feeding means supported by said cover, saidfuel feeding means comprising tubes one of which is within the othersaid tubes being separately-removable.

6. In combination, a furnace wall having an 135 opening therethrough, afuel burner having an air registr larger in diameter than said opening,an air box with an opening for said register to pass through, a coverfor said opening, fuel feeding means supported by said cover, said fuelfeed- 140 ing means comprising tubes one of which is within the other,and a hollow member to which said tubes are attached.

7. In combination, a furnace wall having an opening therethrough, a fuelburner having an 145 air register larger in diameter than said opening,an air box with an opening for said register to pass through, a coverfor said opening, fuel feeding means supported by said cover, said fuel150 feeding means comprising tubes one of which is assesses within theother, and a gas nozzle attached to one of said tubes.

8. In a fuel burner, an inlet for a furnace wall, and a flange on saidinlet, said flange being provided with a notch whereby tile may beapplied to the outside of said inlet by a movement substantiallyparallel to the axis of said inlet.

9. In a fuel burner, a conically shaped inlet for a furnace, an exteriorflange on the outside of said inlet for holding tile, said flange beingprovided with a slot for installation and removal of the tile.

10. In a fuel burner, an air chamber, means for retaining said airchamber in proximity to an opening in a furnace wall, and means forprojecting different fuels through said opening,- said first-named meanscomprising guide rails which extend outwardly from said furnace wall.

11. A furnace wall combination fuel burner arranged to discharge througha furnace wall opening and comprising casing means forming an airchamber at the outer end of said wall opening, a circular series ofwhirling vanes mounted in the outer portion of said wall opening, a fuelsupply pipe having means for effecting a diverging fuel dischargetherefrom adjacent the inner end of said series of whirling vanes, and asecond fuel supply pipe having means for effecting a diverging fueldischarge therefrom also adjacent the inner end of said series ofwhirling vanes, whereby a substantially similar mixing of the fuel fromeach supply pipe with the whirling air stream can be effected.

12. A furnace wall combination fuel burner arranged to discharge througha furnace wall opening having a converging outer portion and comprisingcasing means forming an air chamber at the outer end of said wallopening, a circular series of whirling vanes mounted in the convergingportion of said wall opening, a fuel supply pipe having means within andadjacent to the inner end of said series of whirling vanes for effectinga diverging fuel discharge therefrom, and a second fuel supply pipehaving means within and adjacent to the inner end of said series ofwhirling vanes for effecting a diverging fuel discharge therefrom,whereby a substantially similar mixing of the fuel from each supply pipewith the whirling air stream can be effected.

13. A furnace wall combination fuel burner arranged to discharge througha furnace wall opening having a converging outer portion and comprisingcasing means'forming an air chamber at the outer end of said wallopening, a circular series of whirling vanes mounted in the convergingportion of said wall opening, a fuel supply pipe having means foreffecting a diverging fuel discharge therefrom adjacent the inner end ofsaid series of whirling vanes, a second fuel supply pipe having meansfor effecting a diverging fuel discharge therefrom also adjacent theinner end of said series of whirling vanes, and a ventilated airdeflector centrally arranged in said wall opening adjacent said pointsof fuel discharge. whereby a substantially similar mixing of the fuelfrom each supply pipe with the whirling air stream can be effected.

NORMAN HUBBARD.

